The CVSA analyzes micro-tremors in voice patterns to detect stress, while a polygraph measures physiological responses such as heart rate, blood pressure, and respiration.
Polygraphs have been studied extensively over decades, and while still controversial, they have more scientific backing compared to CVSA, which lacks widespread peer-reviewed research to confirm its reliability.
Layered Voice Analysis (LVA) goes beyond detecting stress and attempts to analyze emotions, cognitive load, and other psychological factors, while CVSA focuses specifically on identifying stress patterns.
CVSA requires only a microphone and software installed on a computer, making it more portable and easier to set up compared to polygraphs, which involve multiple sensors and more complex equipment.
Both tools are typically not admissible in court due to questions about their reliability and scientific validity. Courts generally consider them as investigative tools rather than definitive evidence.
